CN111594410B - Chain type liquid piston compression system - Google Patents
Chain type liquid piston compression system Download PDFInfo
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- CN111594410B CN111594410B CN202010502520.8A CN202010502520A CN111594410B CN 111594410 B CN111594410 B CN 111594410B CN 202010502520 A CN202010502520 A CN 202010502520A CN 111594410 B CN111594410 B CN 111594410B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
- F04B35/008—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being a fluid transmission link
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B25/00—Multi-stage pumps
Abstract
The invention discloses a chain type liquid piston compression system, which comprises the following steps: 1. before compression, the first pressure container is connected with an external low-pressure pipeline, the other pressure containers are used as a high-pressure container group to be connected in series and connected with high pressure through a one-way valve, and the liquid driving device controls the first pressure container to be connected with a liquid passage of the high-pressure container group; 2. when in compression, liquid in the first pressure container enters the high-pressure container group through the liquid driving device, and low-pressure gas enters the first pressure container to form a low-pressure container group; the gas in the high-pressure container group is compressed, and the pressure container filled with liquid in the high-pressure container group is switched to a low-pressure pipeline through a valve to be converted into a first pressure container; 3. circularly executing the step 2, and completing one-time chain type compression when the high-pressure container group is completely converted into the low-pressure container group; 4. and (3) regarding all the low-pressure container groups as high-pressure container groups, taking the last container as a first pressure container, cutting the last container into a low-pressure pipeline, and repeatedly executing the steps 1-3 to realize continuous chain compression and reversibility of the compression direction.
Description
Technical Field
The invention relates to the technical field of energy storage of large-scale power systems, in particular to a chained liquid piston compression system.
Background
In recent years, with the continuous development of economy in China, the power consumption is continuously increased. The problems of grid frequency caused by the large-scale application of new energy and intermittent renewable energy, the expansion and growth of the traditional power peak-valley difference value and the related problems of various power energy sources continuously appear. The compressed air energy storage is an important energy storage technology, has the advantages of low construction and operation cost, long working time, long service life, small site limitation and the like, and is an energy storage technology with great development prospect.
The existing staged air compression technology utilizes a plurality of liquid driving devices with different pressure-resistant grades to be connected in pairs, and a piston cylinder of each compression grade only compresses a part of pressure range. The problem of when handling less pressure gas, the withstand voltage performance redundancy of the equipment of building is solved. However, in the hydraulic equipment of each compression class, the pressure vessel needs to be filled with liquid, the amount of the used compression liquid is large, the volume of the pressure vessel is also large, and the construction cost is high.
It is therefore desirable to have a chain-type liquid piston compression system that solves the problems of the prior art.
Disclosure of Invention
The invention discloses a chain type liquid piston compression system, which is characterized in that three or more pressure containers with equal storage capacity are connected in pairs, the pressure containers are divided into a low-pressure container group and a high-pressure container group, and the pressure container filled with liquid is called as a first pressure container; the use method of the chained liquid piston compression system comprises the following steps:
the method comprises the following steps: the pressure container filled with liquid is called as a first pressure container, before compression, the first pressure container is connected with an external low-pressure pipeline, the other two or more pressure containers are used as a high-pressure container group to be connected in series and are connected with an external high-pressure pipeline through a one-way valve, and a liquid driving device controls the liquid passage connection of the first pressure container and the high-pressure container group through the valve;
step two: during compression, liquid in the first pressure container enters the high-pressure container group through the liquid driving device, and low-pressure gas enters the first pressure container to form a low-pressure container group; the gas in the high-pressure container group is compressed, and the pressure container filled with liquid in the high-pressure container group is switched to a low-pressure pipeline through a valve to be converted into a first pressure container;
step three: circularly executing the step two, namely, reducing the number of the high-pressure container groups, and completing one-time chain compression when the high-pressure container groups are completely converted into the low-pressure container groups or the first pressure container;
step four: and (3) regarding all the low-pressure container groups as high-pressure container groups, taking the last container as a first pressure container, cutting the last container into a low-pressure pipeline, and repeatedly executing the steps from one step to three to realize continuous chain compression and reversibility of the compression direction.
Preferably, the connection mode of the pressure container and the liquid driving device comprises the following steps:
the first method is as follows: a liquid driving device is used, and inlet and outlet pipelines of the liquid driving device are connected with all pressure containers and controlled to be disconnected through a valve control strategy;
the second method comprises the following steps: n-1 liquid drive units are used, wherein the number of pressure vessels is n, and each liquid drive unit is connected with two adjacent pressure vessels.
Preferably, in the first mode, the inlet pipeline and the outlet pipeline of the liquid driving device are respectively connected with n-1 pressure containers, the chain type compression system is symmetrical, and the system structure does not need to be changed when the compression direction is turned.
Preferably, the valve control strategy in the first mode is as follows: when liquid in one pressure container enters one of the adjacent high-pressure container groups, the high-pressure container is connected and closed with the outlet end of the liquid driving device and is connected and opened with the inlet end, and the original first pressure container is connected and closed with the inlet end of the liquid driving device; the next high-pressure container is connected and opened with the outlet end of the liquid driving device until the last pressure container in the current compression direction is filled with liquid;
after one-time compression is completed, the pipeline valve controls and converts the compression direction, so that the compression direction is reversible, and the compression efficiency is improved.
Preferably, the turning compression direction is: when the primary compression is finished, the liquid driving device and the valves of the pressure containers are completely disconnected for conversion, the original last pressure container is taken as a first pressure container, and the liquid is compressed in the direction of the penultimate pressure container.
The invention provides a chain type liquid piston compression system, which has the beneficial effects that:
1. compared with the prior compressed air technology which needs to use a tank body with larger volume, the compressed liquid which is equivalent to a pressure container needs to be used, the liquid quantity is larger, and the liquid volume used by the invention is smaller. If the chain type compression unit has n pressure containers, the invention uses the liquid volume as follows:
conventional air compression techniques use a liquid volume of
2. The invention uses a plurality of pressure containers for connection, the total tank volume of the pressure containers is smaller than that of the conventional compressed air technology, and the pressure containers used by the inventionThe volume of the device is V, and the volume of the pressure container used in the conventional staged air compression technology is V
The construction cost of the pressure vessel is lower.
3. The invention can change the compression direction when compressing by using a plurality of pressure containers. And based on above-mentioned chain compression structure and connected mode, the operation of changing the compression direction is comparatively simple. The efficiency of compressed air is improved.
4. The invention has strong adaptability and can change the structure aiming at different compression ranges. The number of pressure vessels used can be varied within a reasonable range, and when the compression range is small, the number of pressure vessels can be reduced, the equipment cost can be reduced, and the complexity of the control system can be reduced.
5. The amount of liquid used in each compression is small, so the power and capacity specifications of the liquid driving equipment are reduced, and the equipment cost and the system operation cost are reduced.
Drawings
FIG. 1 is a schematic structural view of a mode-one connection between a pressure vessel and a fluid driving device before compression according to the present invention.
FIG. 2 is a schematic structural view of the present invention before compression, in which the pressure vessel and the fluid driving device are connected in a second mode.
Fig. 3 is a schematic diagram of five steps in the forward compression process of the present invention.
Fig. 4 is a schematic diagram of five steps in the reverse compression process of the present invention.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The chain type liquid piston compression system comprises a pressure container chain formed by connecting three or more pressure containers and a liquid driving device. The head end and the tail end of the pressure container chain are connected with high-pressure and low-pressure gas pipelines, the inlet end and the outlet end of the liquid driving device are respectively connected with (n-1) pressure containers, and the compression state is changed through valve control in the compression process. And n is the number of the total pressure containers, a low-pressure gas pipeline is connected with a low-pressure gas source to inject low-pressure gas into the pressure containers, and a high-pressure gas pipeline is connected with a high-pressure gas storage tank to store high-pressure gas.
Pressure vessels can be divided into two groups: a low pressure vessel group and a high pressure vessel group. In the current compression direction, the pressure vessels through which the liquid has passed are filled with low-pressure gas, called low-pressure vessel groups and connected to each other; the pressure vessels through which the liquid does not pass are called a high-pressure vessel group, and the high-pressure vessel group is connected with each other. In addition, before the liquid driving device is switched by the valve, the pressure container filled with liquid is the first pressure container, and the first pressure container is connected with the low-pressure container group.
The liquid driving device G is driven by electric power or other external energy sources to inject liquid into the high-pressure container group and synchronously compress gas in the high-pressure container group. I.e. using the external electric energy or other energy source for driving the equipment to convert into the potential energy of the high-pressure air.
The device is reversible in the compression direction, and the sequencing exists on the arrangement of the pressure vessels. When the compression action in one direction is finished, the compression direction is switched under the control of a pipeline valve, so that the role of the pressure container is switched.
The connection between the pressure vessels is controlled by a specific valve control strategy, the connection between the pressure vessels being a gas channel, which in chain compression is opened in order to equalize the gas pressure in the interconnected pressure vessel battery, and in which air in the high pressure vessel battery can be compressed simultaneously.
The control valve of the low-pressure gas pipeline is a one-way valve, and gas can only flow into the pressure container from a low-pressure gas source. The low-pressure air source refers to air with pressure meeting the lower limit of the compression range of the chain type compression equipment, the pressure of the air is determined according to the compression requirement, and the air pressure can be from an air compressor with lower pressure or ambient air.
The control valve of the high-pressure gas pipeline is a one-way valve, and gas can only flow from the pressure container to the high-pressure gas tank in a one-way mode.
The channel between the liquid driving device and the pressure container is a liquid channel controlled by a valve, and a single liquid driving device can be switched between two different pressure containers through the control of a specific valve control strategy.
The valve control strategy of the liquid driving device refers to that: when the liquid amount in the first pressure container is detected to be lower than a set low water level zero value, the inlet valve of the liquid driving device is closed; when the liquid pressure in one of the high-pressure container groups adjacent to the liquid pressure detection device reaches a fixed value, the outlet valve of the liquid driving device is closed. Then opening a channel valve between the input end of the liquid driving device and the high-pressure container, and converting the high-pressure container into a new first pressure container; and connecting the outlet end of the liquid driving device with one of the adjacent high-pressure container groups.
The control strategy of the pressure vessel connection refers to that: in the initial state, the first pressure vessel is filled with liquid, and the other pressure vessels are connected with each other to form a high-pressure vessel group. In the compression process, when all liquid in the first pressure container is transferred out, the connecting channel between the adjacent high-pressure container and the high-pressure container group is disconnected, and the adjacent high-pressure container and the high-pressure container group are used as a new first pressure container to be connected with the low-pressure container group.
As shown in fig. 1, the chain type liquid piston compression system includes: the pressure container A1, the pressure container A2, the pressure container A3 and the pressure container A4 are connected to form a pressure container chain, and a liquid driving device G; wherein, the pressure vessel A1 is connected with a high-pressure gas pipeline D1 and a low-pressure gas pipeline D2, the pressure vessel A4 is connected with a high-pressure gas pipeline D3 and a low-pressure gas pipeline D4, and the pressure vessels A1-A4 are connected by controlling valves E1-E3 among the pressure vessels; the outlets of the pressure container A1, the pressure container A2 and the pressure container A3 are respectively connected with a valve B1, a valve B2 and a valve B4 of a control liquid driving device, and are finally connected with the inlet of a liquid driving device G through a valve B7 of the control liquid driving device; the outlets of the pressure container A2, the pressure container A3 and the pressure container A4 are respectively connected with a valve B3, a valve B5 and a valve B6 of a control liquid driving device, and are finally connected with the outlet of the liquid driving device G through a valve B8 of the control liquid driving device.
As shown in fig. 2, the chain type liquid piston compression system includes: the pressure vessel A1, the pressure vessel A2, the pressure vessel A3 and the pressure vessel A4 are connected to form a pressure vessel chain, and three liquid driving devices G1-G3; wherein, the pressure vessel A1 is connected with a high-pressure gas pipeline D1 and a low-pressure gas pipeline D2, the pressure vessel A4 is connected with a high-pressure gas pipeline D3 and a low-pressure gas pipeline D4, and the pressure vessels A1-A4 are connected by controlling valves E1-E3 among the pressure vessels; the outlet of the pressure vessel A1 is connected with the inlet of the liquid driving device G1 through a valve, the outlet of the liquid driving device G1 is connected with the inlet of the pressure vessel A2 through a valve, the outlet of the pressure vessel A2 is connected with the inlet of the liquid driving device G2 through a valve, the outlet of the liquid driving device G2 is connected with the inlet of the pressure vessel A3 through a valve, the outlet of the pressure vessel A3 is connected with the inlet of the liquid driving device G3 through a valve, and the outlet of the liquid driving device G3 is connected with the inlet of the pressure vessel A4 through a valve.
As shown in fig. 1 and 3, the forward compression process of the chain type liquid piston compression system using a single liquid driving apparatus includes:
the first state: as shown in FIG. 3-A, in an initial state, pressure vessel A1 is filled with liquid and low pressure gas line D2 is connected. The valves E2, E3 are closed, and the pressure vessels A2, A3, A4 are connected.
And a second state: in the first compression state, as shown in fig. 3-B, the low-pressure gas pipe D2 is connected to the pressure vessel a1, the valves B1, B3, B7 and B8 are closed, the outlet of the valve pressure vessel a1 is connected to the inlet of the liquid driving apparatus G, the outlet of the liquid driving apparatus G is connected to the inlet of the pressure vessel a2, and the liquid is transferred from a1 to a2 via the driving apparatus G. The valves E2, E3 are closed, and the pressure vessels A2, A3, A4 are connected.
And a third state: in the second compression state, as shown in fig. 3-C, the low-pressure gas pipe D2 is connected to the pressure vessel a1, the valves B2, B5, B7 and B8 are closed, the outlet of the valve pressure vessel a2 is connected to the inlet of the liquid driving apparatus G, the outlet of the liquid driving apparatus G is connected to the inlet of the pressure vessel A3, and the liquid is transferred from a2 to A3 via the driving apparatus G. Valves E1, E3 are closed, pressure vessels A1, A2 are connected, and pressure vessels A3, A4 are connected.
And a fourth state: in the third compression state, as shown in fig. 3-D, the low-pressure gas pipe D2 is connected to the pressure vessel a1, the valves B4, B6, B7 and B8 are closed, the outlet of the valve pressure vessel A3 is connected to the inlet of the liquid driving apparatus G, the outlet of the liquid driving apparatus G is connected to the inlet of the pressure vessel a4, and the liquid is transferred from A3 to a4 via the driving apparatus G. The valves E1, E2 are closed, and the pressure vessels A1, A2, A3 are connected.
And a fifth state: as shown in fig. 3-E, the compression end state. The high-pressure gas pipeline D3 is connected to the pressure container A4, the pressure container A4 is filled with liquid, and the high-pressure gas is output through the high-pressure gas pipeline D3. The valves E1, E2 are closed, and the pressure vessels A1, A2, A3 are connected.
As shown in fig. 1 and 4, the reverse compression process of the chain type liquid piston compression system using a single liquid driving apparatus includes:
the first state: as shown in FIG. 4-A, in an initial state, pressure vessel A4 is filled with liquid and low pressure gas line D4 is connected. The valves E1, E2 are closed, and the pressure vessels A1, A2, A3 are connected.
And a second state: in the first compression state, as shown in fig. 4-B, the low-pressure gas pipe D4 is connected to the pressure vessel a4, the valves B4, B6, B7 and B8 are closed, the outlet of the valve pressure vessel a4 is connected to the inlet of the liquid driving apparatus G, the outlet of the liquid driving apparatus G is connected to the inlet of the pressure vessel A3, and the liquid is transferred from a4 to A3 via the driving apparatus G. The valves E1, E2 are closed, and the pressure vessels A1, A2, A3 are connected.
And a third state: in the second compression state, as shown in fig. 4-C, the low-pressure gas pipe D4 is connected to the pressure vessel a4, the valves B2, B5, B7 and B8 are closed, the outlet of the valve pressure vessel A3 is connected to the inlet of the liquid driving apparatus G, the outlet of the liquid driving apparatus G is connected to the inlet of the pressure vessel a2, and the liquid is transferred from A3 to a2 via the driving apparatus G. Valves E1, E3 are closed, pressure vessels A1, A2 are connected, and pressure vessels A3, A4 are connected.
And a fourth state: in the third compression state, as shown in fig. 4-D, the low-pressure gas pipe D4 is connected to the pressure vessel a4, the valves B1, B3, B7 and B8 are closed, the outlet of the valve pressure vessel a2 is connected to the inlet of the liquid driving apparatus G, the outlet of the liquid driving apparatus G is connected to the inlet of the pressure vessel a1, and the liquid is transferred from a2 to a1 via the driving apparatus G. The valves E2, E3 are closed, and the pressure vessels A2, A3, A4 are connected.
And a fifth state: as shown in fig. 4-E, the compression end state. The high-pressure gas pipeline D1 is connected to the pressure container A1, the pressure container A1 is filled with liquid, and the high-pressure gas is output through the high-pressure gas pipeline D1. The valves E2, E3 are closed, and the pressure vessels A2, A3, A4 are connected.
Finally, it should be pointed out that: the above examples are only for illustrating the technical solutions of the present invention, and are not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (3)
1. The chain type liquid piston compression system is characterized in that three or more pressure containers with equal storage capacity are connected in pairs, the pressure containers are divided into a low-pressure container group and a high-pressure container group, and the pressure container filled with liquid is called as a first pressure container; the use method of the chained liquid piston compression system comprises the following steps:
the method comprises the following steps: the pressure container filled with liquid is called as a first pressure container, before compression, the first pressure container is connected with an external low-pressure pipeline, the other two or more pressure containers are used as a high-pressure container group to be connected in series and are connected with an external high-pressure pipeline through a one-way valve, and a liquid driving device controls the liquid passage connection of the first pressure container and the high-pressure container group through the valve;
step two: during compression, liquid in the first pressure container enters the high-pressure container group through the liquid driving device, and low-pressure gas enters the first pressure container to form a low-pressure container group; the gas in the high-pressure container group is compressed, and the pressure container filled with liquid in the high-pressure container group is switched to a low-pressure pipeline through a valve to be converted into a first pressure container;
step three: circularly executing the step two, namely, reducing the number of the high-pressure container groups, and completing one-time chain compression when the high-pressure container groups are completely converted into the low-pressure container groups or the first pressure container;
step four: taking all the low-pressure container groups as high-pressure container groups, taking the last container as a first pressure container, cutting the last container into a low-pressure pipeline, and repeatedly executing the steps from one step to three to realize continuous chain compression and reversibility of the compression direction;
the connection mode of the pressure container and the liquid driving device comprises the following steps:
the first method is as follows: a liquid driving device is used, and inlet and outlet pipelines of the liquid driving device are connected with all pressure containers and controlled to be disconnected through a valve control strategy;
the second method comprises the following steps: n-1 liquid driving devices are used, wherein the number of the pressure containers is n, and each liquid driving device is connected with two adjacent pressure containers;
the valve control strategy in the first mode is as follows: when liquid in one pressure container enters one of the adjacent high-pressure container groups, the high-pressure container is connected and closed with the outlet end of the liquid driving device and is connected and opened with the inlet end, and the original first pressure container is connected and closed with the inlet end of the liquid driving device; the next high-pressure container is connected and opened with the outlet end of the liquid driving device until the last pressure container in the current compression direction is filled with liquid;
after one-time compression is completed, the pipeline valve controls and converts the compression direction, so that the compression direction is reversible, and the compression efficiency is improved.
2. The chain liquid piston compression system of claim 1, further comprising: in the first mode, the inlet pipeline and the outlet pipeline of the liquid driving device are respectively connected with n-1 pressure containers, the chain type compression system is symmetrical, and the structure of the system does not need to be changed when the compression direction is turned.
3. The chain liquid piston compression system of claim 2, further comprising: the turning compression direction is as follows: when the primary compression is finished, the liquid driving device and the valves of the pressure containers are completely disconnected for conversion, the original last pressure container is taken as a first pressure container, and the liquid is compressed in the direction of the penultimate pressure container.
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